A nurse researcher assigns half a study sample to an experimental group and the other half to a control group. What does this action represent?
a. Instrumentation of the independent variable
b. Manipulation of the mediating variable
c. Elimination of the mediating variable
d. Manipulation of the independent variable
ANS: D
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A Separating subjects into treatment and control groups does not represent instrumentation of the independent variable.
B A mediating or extraneous variable is usually controlled rather than manipulated.
C Separation of study subjects into treatment and control groups does not by itself eliminate mediating variables.
D Administration of a treatment or intervention to an experimental (treatment) group and not to a control group represents manipulation of the independent variable.
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